ZDI-12-157 : Microsoft Excel Series Record Parsing Type Mismatch Remote Code Execution Vulnerability

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ZDI-12-157 : Microsoft Excel Series Record Parsing Type Mismatch Remote
Code Execution Vulnerability
http://www.zerodayinitiative.com/advisories/ZDI-12-157
August 22, 2012

• – CVE ID:
  CVE-2012-1847

• – CVSS:
  7.5, AV:N/AC:L/Au:N/C:P/I:P/A:P

• – Affected Vendors:
  Microsoft

• – Affected Products:
  Microsoft Office

• – TippingPoint(TM) IPS Customer Protection:
  TippingPoint IPS customers have been protected against this
  vulnerability by Digital Vaccine protection filter ID 12480.
  For further product information on the TippingPoint IPS, visit:

  http://www.tippingpoint.com

• – Vulnerability Details:
  This vulnerability allows remote attackers to execute arbitrary code on
  vulnerable installations of Microsoft Office Excel. User interaction is
  required to exploit this vulnerability in that the target must visit a
  malicious page or open a malicious file.

The specific flaw exists within the parsing of Series records. The code
within Excel.exe makes an assumption about the data types within a Series
record and can be made to write beyond the bounds of a heap buffer when a
specific combination of fields are set to unexpected values. This
corruption can be leveraged to achieve code execution under the context of
the user running the application.

• – Vendor Response:
  Microsoft has issued an update to correct this vulnerability. More details
  can be found at:
  https://technet.microsoft.com/en-us/security/bulletin/MS12-030

• – Disclosure Timeline:
  2012-01-24 - Vulnerability reported to vendor
  2012-08-22 - Coordinated public release of advisory

• – Credit:
  This vulnerability was discovered by:

• Anonymous

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